Left file: appwork-v1_3_1/angular-starter/src/app/app-routing.module.ts  
Right file: appwork-v1_4_0/angular-starter/src/app/app-routing.module.ts  

import { NgModule } from '@angular/core';	=	import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';		import { Routes, RouterModule } from '@angular/router';
	-+	import { NotFoundComponent } from './not-found/not-found.component';
	=
// *******************************************************************************		// *******************************************************************************
// Layouts		// Layouts
import { Layout1Component } from './layout/layout-1/layout-1.component';		import { Layout1Component } from './layout/layout-1/layout-1.component';
// *******************************************************************************		// *******************************************************************************
// Pages		// Pages
import { HomeComponent } from './home/home.component';		import { HomeComponent } from './home/home.component';
import { Page2Component } from './page-2/page-2.component';		import { Page2Component } from './page-2/page-2.component';
// *******************************************************************************		// *******************************************************************************
// Routes		// Routes
const routes: Routes = [		const routes: Routes = [
{ path: '', component: Layout1Component, pathMatch: 'full', children: [		{ path: '', component: Layout1Component, pathMatch: 'full', children: [
{ path: '', component: HomeComponent },		{ path: '', component: HomeComponent },
]},		]},
{ path: 'page-2', component: Layout1Component, children: [		{ path: 'page-2', component: Layout1Component, children: [
{ path: '', component: Page2Component },		{ path: '', component: Page2Component },
]}	<>	]},
		// 404 Not Found page
		{ path: '**', component: NotFoundComponent }
	=
];		];
// *******************************************************************************		// *******************************************************************************
//		//
@NgModule({		@NgModule({
imports: [RouterModule.forRoot(routes)],		imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]		exports: [RouterModule]
})		})
export class AppRoutingModule {}		export class AppRoutingModule {}